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Abstract
The smoothness of cavity walls prepared with various cutting instruments and methods was microscopically compared in their sections, as follows.Little difference was observed between the wall finished with the dentate bur and the plain bur of same form. The fineness of the bur blades seemed to be more important for the wall smoothness, and the fine cut tapered fissure bur without crosscut made the best wall. Therefore, it is quite preferable to finish the cavity margins or marginal bevels with such burs (No. 600-602) .Little difference was observed between the wall finished with chisel and that finished with burs.The wall finished with the dry carborundum point was much coarser than those finished with burs, but it became a little smoother when the point was used under pouring water.The walls cut with the diamond point were very rough in both dry and wet use, and so they must be finished with fine cut burs afterward. However, one should consider that the smoothness of the walls cut with carborundum or diamond points depends on the fineness of their crystals.
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